In Which of the Following Addition Problems (Using Two's Complement $\begin{array} { r } 0011 \\+ 1010 \\\hline\end{array}$

Multiple Choice

In which of the following addition problems (using two's complement notation) does an overflow error occur?

A) $\begin{array} { r } 0011 \\+ 1010 \\\hline\end{array}$
B) $\begin{array} { r } 0100 \\+ 0100 \\\hline\end{array}$
C) $\begin{array} { r } 1100 \\+ 1100 \\\hline\end{array}$